document.write( "Question 1142987: Hi\r
\n" ); document.write( "\n" ); document.write( "a student goes to school at 2.5km/hr and arrives 6 minutes late. If he travels at 3km/hr he arrives 10 minutes early.\r
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Algebra.Com's Answer #763738 by ikleyn(52794) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Let d be the distance to the school (in kilometers).\r\n" );
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document.write( "Going at the speed of  2.5 km/h, the student spends    hours.\r\n" );
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document.write( "Going at the speed  of  3 km/h, the student spends    hours.\r\n" );
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document.write( "The difference is 6 + 10 minutes = 16 minutes =  of an hour =   of an hour.\r\n" );
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document.write( "It gives you the \"time\" equation\r\n" );
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document.write( "     -  = .\r\n" );
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document.write( "At this point, the setup is just completed.\r\n" );
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document.write( "To find \"d\", multiply both sides of the equation (1)  by 30.  You will get\r\n" );
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document.write( "    12d - 10d = 8,\r\n" );
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document.write( "    2d        = 8\r\n" );
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document.write( "     d        = 8/2 = 4 kilometers.\r\n" );
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document.write( "ANSWER.  The distance to the school is 4 kilometers.\r\n" );
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document.write( "CHECK.    = 1.6 hours = 1 hour 36 minutes;    \r\n" );
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document.write( "          =  hours = 1 hour and 20 minutes.\r\n" );
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document.write( "         The difference is 16 minutes -- ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "Using \"time\" equation is the STANDARD method of solving such problems.\r
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\n" ); document.write( "\n" ); document.write( "It is simple, logical, straightforward and economic. Going in this way, you will not make a mistake - the logic of the method
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\n" ); document.write( "\n" ); document.write( "From this lesson, learn on how to write, how to use and how to solve a \"time\" equation.\r
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\n" ); document.write( "\n" ); document.write( "To see many other similar solved problems, look into the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Had a car move faster it would arrive sooner\r
\n" ); document.write( "\n" ); document.write( "    - How far do you live from school?    (*)\r
\n" ); document.write( "\n" ); document.write( "    - Earthquake waves \r
\n" ); document.write( "\n" ); document.write( "    - Time equation: HOW TO use, HOW TO write and HOW TO solve it \r
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\n" ); document.write( "\n" ); document.write( "For the TWIN problem, see the lesson (*) in the list.\r
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